JohannYoddler on Nostr: signing device is a hardware cold wallet? Or do they have devices just to leave ...

signing device is a hardware cold wallet? Or do they have devices just to leave messages on the blockchain or Nostr. Is a portable nostr only palm pilot like device a thing, like a standalone processor that connects to protocols? like this only nostr connected. Awesome Idea
https://hackaday.com/2023/09/05/raspi-powered-typewriter-is-a-real-muse/